618471656 has 48 divisors (see below), whose sum is σ = 1330106400. Its totient is φ = 268891040.

The previous prime is 618471649. The next prime is 618471677. The reversal of 618471656 is 656174816.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8375 + ... + 36153.

It is an arithmetic number, because the mean of its divisors is an integer number (27710550).

Almost surely, 2^618471656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 618471656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665053200).

618471656 is an abundant number, since it is smaller than the sum of its proper divisors (711634744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

618471656 is a wasteful number, since it uses less digits than its factorization.

618471656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27830 (or 27815 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 618471656 is about 24869.0903733932. The cubic root of 618471656 is about 852.0006649175. Note that the first 3 decimals are identical.

It can be divided in two parts, 618 and 471656, that added together give a palindrome (472274).

The spelling of 618471656 in words is "six hundred eighteen million, four hundred seventy-one thousand, six hundred fifty-six".